Updated on 2025/04/16

写真a

 
FUKUI TOKURO
 
Organization
Faculty of Arts and Science Division for Theoretical Natural Science Assistant Professor
Title
Assistant Professor
Contact information
メールアドレス
Profile
[研究活動] 「核力は核子多体系をどのように支配しているのだろうか?」先人たちが長年挑んできたものの未だ完全な答えが得られていないこの問いに対して、先鋭的理論を駆使して挑戦している。最近は重いクォークを含むハドロン間相互作用や、宇宙元素合成で鍵となる核反応の精密計算、中性子星の物理などにも興味を持っている。 [教育活動] 基幹教育のうち、「自然科学総合実験」や「基幹教育セミナー」を担当している。また総合科目「実践!わたしの研究」を担当し、学生の "研究" への挑戦を後押ししている。

Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Degree

  • Doctor of Philosophy (Science)

Research History

  • Kyushu University Faculty of Arts and Science Division for Theoretical Natural Science  Assistant Professor 

    2022.11 - Present

  • RIKEN RIKEN Nishina Center for Accelerator-Based Science Visiting Researcher 

    2023.4 - Present

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  • RIKEN RIKEN Nishina Center for Accelerator-Based Science Special Postdoctoral Researcher 

    2021.3 - 2022.10

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    Country:Japan

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Education

  • Osaka University    

    - 2015.3

Research Interests・Research Keywords

  • Research theme: Nuclear Force/Nuclear Structure/Nuclear Reaction

    Keyword: Nuclear Force/Nuclear Structure/Nuclear Reaction

    Research period: 2024

  • Research theme: Strong Interaction

    Keyword: Strong Interaction

    Research period: 2024

  • Research theme: Nuclear Astrophysics

    Keyword: Nuclear Astrophysics

    Research period: 2024

  • Research theme: Theoretical Nuclear Physics

    Keyword: Theoretical Nuclear Physics

    Research period: 2024

  • Research theme: Study of many-nucleon systems based on state-of-the-art theory

    Keyword: Theoretical Nuclear Physics, Nuclear Force, Nuclear Structure, Nuclear Reaction, Strong Interaction, Three-nucleon force, Nuclear Astrophysics

    Research period: 2010.4

Awards

  • Young Scientist Award of the Physical Society of Japan

    2022.3   Physical Society of Japan   Development of first-principles shell-model calculations via proper treatment of three-body force

    Tokuro Fukui

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  • 2022年度基礎科学特別研究員成果発表会 優秀賞

    2023.1   理化学研究所   Presentation Award of FY2022 SPDR Presentation of Research Results, RIKEN

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    理化学研究所基礎科学特別研究員の成果発表会において物理学Iの分野で優秀な研究成果および発表をした者に贈られる賞を受賞した。

  • Presentation Award of FY2022 SPDR Presentation of Research Results

    2023.1   RIKEN  

    Tokuro Fukui

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  • 第16回(2022年)日本物理学会若手奨励賞

    2022.3   日本物理学会   Young Scientist Award of the Physical Society of Japan, 2022

Papers

  • Uncovering the mechanism of chiral three-nucleon force in driving spin-orbit splitting

    Tokuro Fukui, Giovanni De Gregorio, Angela Gargano

    Physics Letters B   855   2024.8   ISSN:0370-2693 eISSN:1873-2445

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    Publishing type:Research paper (scientific journal)   Publisher:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics  

    The three-nucleon force (3NF) is crucial in shaping the shell structure of atomic nuclei, particularly impacting the enhancement of spin-orbit (SO) splitting, especially in nuclei with significant deviations from stability. Despite its importance, the specific mechanisms driving this enhancement remain unclear. In this study, we introduce a decomposition scheme based on the rank of irreducible tensors forming the 3NF, derived from chiral effective field theory at next-to-next-to-leading order, to elucidate their influence on SO splitting. Within the shell-model framework, our analysis reveals that the rank-1 component of the 3NF is the primary factor enlarging the energy gap between the 0p3/2 and 0p1/2 single-particle levels in p-shell nuclei, while the rank-2 component makes a subdominant contribution. Since the rank-1 component originates exclusively from the 2π-exchange 3NF, our finding will not depend on the choice of the low-energy constants of contact terms. We also remark on the antisymmetry of the rank-1 3NF, which can affect the quantum entanglement of spin states. This study lays the groundwork for further exploration into this field toward a microscopic understanding of the 3NF impact on the nuclear shell structure.

    DOI: 10.1016/j.physletb.2024.138839

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  • Investigation of spatial manifestation of α clusters in 16O via α-transfer reactions

    Tokuro Fukui, Yoshiko Kanada-En'yo, Kazuyuki Ogata, Tadahiro Suhara, Yasutaka Taniguchi

    Nuclear Physics A   983   38 - 52   2019.3

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    Language:Others   Publishing type:Research paper (scientific journal)  

    Recently, we have determined surface distributions of α clusters in the ground state of Ne20 from α-transfer cross sections, without investigating the properties of its excited states. In this paper we extend our comprehension of α-cluster structures in excited states of nuclei through reaction studies. In particular we focus on O16, for which attention has been paid to advances of structure theory and assignment regarding 4+-resonance states. We study the surface manifestation of the α-cluster states in both the ground and excited states of O16 from the analysis of the α-transfer reaction C12(Li6,d)16O. The α-transfer reaction is described by the distorted-wave Born approximation. We test two microscopic wave functions as an input of reaction calculations. Then a phenomenological potential model is introduced to clarify the correspondence between cluster-wave functions and transfer-cross sections. Surface peaks of the α-wave function of O16(0+) are sensitively probed by transfer-cross sections at forward angles, while it remains unclear how we trace the surface behavior of O16(4+) from the cross sections. From inspection of the cross sections at forward angles, we are able to specify that the α-cluster structure in the 01+ and 02+ states prominently manifests itself at the radii ∼4 and ∼4.5 fm, respectively. It is remarkable that the 41+ state has the C12+α-cluster component with the surface peak at the radius ∼4 or outer, whereas the C12+α-cluster component in the 42+ state is found not to be dominant. The 42+ state is difficult to be interpreted by a simple potential model assuming the C12+α configuration only.

    DOI: 10.1016/j.nuclphysa.2018.12.024

  • Realistic shell-model calculations for p -shell nuclei including contributions of a chiral three-body force

    T. Fukui, L. De Angelis, Y. Z. Ma, L. Coraggio, A. Gargano, N. Itaco, F. R. Xu

    Physical Review C   98 ( 4 )   2018.10

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    Language:Others   Publishing type:Research paper (scientific journal)  

    In this paper we present an evolution of our derivation of the shell-model effective Hamiltonian, namely introducing effects of three-body contributions. More precisely, we consider a three-body potential at next-to-next-to-leading order in chiral perturbation theory, and the induced three-body forces that arise from many-body correlations among valence nucleons. The first one is included, in the derivation of the effective Hamiltonian for one- and two-valence nucleon-systems, at first order in the many-body perturbation theory. Namely, we include only the three-body interaction between one or two valence nucleons and those belonging to the core. For nuclei with more than two valence particles, both induced - turned on by the two-body potential - and genuine three-body forces come into play. Since it is difficult to perform shell-model calculations with three-body forces, these contributions are estimated for the ground-state energy only. To establish the reliability of our approximations, we focus attention on nuclei belonging to the p shell, aiming to benchmark our calculations against those performed with the ab initio no-core shell model. The obtained results are satisfactory, and pave the way to the application of our approach to nuclear systems with heavier masses.

    DOI: 10.1103/PhysRevC.98.044305

  • Calculation of Gamow-Teller and two-neutrino double- β decay properties for Te 130 and Xe 136 with a realistic nucleon-nucleon potential

    L. Coraggio, L. De Angelis, T. Fukui, A. Gargano, N. Itaco

    Physical Review C   95 ( 6 )   2017.6

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    Language:Others   Publishing type:Research paper (scientific journal)  

    We report on the calculation of Gamow-Teller and double-β decay properties for nuclei around Sn132 within the framework of the realistic shell model. The effective shell-model Hamiltonian and Gamow-Teller transition operator are derived by way of many-body perturbation theory, without resorting to the empirical effective quenching factor for the Gamow-Teller operator. The results are then compared with the available experimental data, in order to establish the reliability of our approach. This is a mandatory step before we apply the same methodology, in forthcoming studies, to the calculation of the neutrinoless double-β decay nuclear matrix elements for nuclei that are currently considered among the best candidates for the detection of this process.

    DOI: 10.1103/PhysRevC.95.064324

  • Deuteron-Ξcorrelation function studied with three-body model

    Fukui, T; Ogata, K; Kamiya, Y; Ohnishi, A

    NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS   48 ( 1 )   2025.1   ISSN:2037-4909 eISSN:1826-9885

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    Publisher:Nuovo Cimento della Societa Italiana di Fisica C  

    Many-baryon forces play a crucial role in shaping the structure and dynamics of many-baryon systems. Utilizing three-body correlation functions in femtoscopy offers a promising tool for probing three-baryon forces. However, the dynamics of three-body systems necessary for obtaining these correlation functions remains incompletely understood. In this study, we employ the continuum-discretized coupled channels method, a precise and cost-effective three-body model, to explore the influence of deuteron excitation to its continuum states on the deuteron-Ξ correlation function. Our findings reveal that the deuteron-Ξ interaction derived from lattice quantum chromodynamics does not yield a bound state. Moreover, we determine that the effect of deuteron excitation leads to less than a 10% increase in the correlation function, suggesting the predominance of direct deuteron formation through heavy-ion collisions. Overall, our work lays the groundwork for further investigations aimed at elucidating many-baryon forces.

    DOI: 10.1393/ncc/i2025-25038-9

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Books

  • 自然科学総合実験

    九州大学基幹教育院 編 (執筆担当 I-1–I-28)(Role:Joint author)

    学術図書出版社  2024.3 

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    Language:Japanese   Book type:Scholarly book

    ISBN978-4-7806-1199-1, C3040

    Repository Public URL: https://hdl.handle.net/2324/7170868

Presentations

Professional Memberships

  • The Physical Society of Japan

    2010.7 - Present

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  • The Physical Society of Japan

Committee Memberships

  • RIKEN   RIBF Theory Forum  

    2021.4 - Present   

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Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

Other

  • プレスリリース「量子キャッチボールの新たな仕組みを解明」

    2024.7

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    https://www.kyushu-u.ac.jp/ja/researches/view/1123

  • Press Release "An overlooked nuclear force helps keep matter stable"

    2025.1

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    https://www.kyushu-u.ac.jp/en/researches/view/322

Research Projects

  • Exploration of Nuclear Clusters through Three-Nucleon Forces

    Grant number:23KK0250  2024 - 2026

    Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research)

    福井 徳朗

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    Grant type:Scientific research funding

    国内外で注目されている原子核のクラスター現象は、物質の非一様性の創発という観点から重要である。原子核クラスターの形成メカニズムには未解明の点が多く残されている。特に、原子核を構成する核子間に働く相互作用がどのように寄与してクラスターを生み出すのかが解明されていない。基課題(21K13919)では核力の中でも2核子力の役割に焦点を当てた研究を進めており、これまでに重要な知見を得た。しかし、原子核クラスターの発現機構を解明するにはまだ難題が残されている。この国際共同研究では、この難題を克服するために、3核子力がクラスター化を促進するという予想を理論的に提唱し、基礎課題を発展させる。

    CiNii Research

  • JST ERATO 関口三体核力プロジェクト International coauthorship

    2023.10 - 2029.3

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    詳細は以下に記述(https://www.jst.go.jp/erato/research_area/ongoing/jpmjer2304.html)。

  • Exploring Nuclear Giants: Structures and Reactions of Extremely Large Nuclei

    2023.7 - 2025.3

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    Authorship:Principal investigator 

    量子系は典型的な大きさからどれくらい成長できるのだろうか?ある特定の原子核では、典型的な原子核の大きさよりも10倍ほどに膨れ上がった常識を覆すほど巨大な存在形態が理論的に示唆されている。しかし、そのような原子核を実験で確認する手法は確立していない。そこで我々は、非常に巨大な原子核を実証するための方法を理論的な側面から提案しようとしている。具体的には、低エネルギー移行反応が巨大原子核へのアクセスを可能にすることを示そうとしている。本研究は将来的な "nuclear giants" の研究のための礎となることが期待される。

  • Exploring Nuclear Giants: Structures and Reactions of Extremely Large Nuclei (https://usersoffice.rcnp.osaka-u.ac.jp/joint-usage/corenet)

    2023 - 2024

    大阪大学 RCNP COREnet

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    Grant type:Contract research

  • 軽い核におけるクラスター構造の現実的核力に基づいた理論的研究

    2021.4 - 2026.3

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    Authorship:Principal investigator 

    物質は階層性を持ち、階層間の普遍性や独自性の解明は物理学の最重要課題の一つである。近年、各階層におけるクラスター現象を通して、物質の階層構造を解明する研究が精力的に行われている。本研究では、物質階層の中でも、フェムトスケール(10のマイナス15乗メートル)の原子核のクラスター現象に注目する。原子核クラスターに関する課題は、クラスターと核力の関係が解明されていないことである。そこで、先端的な理論が導く核力に基づき、原子核クラスター構造を微視的に理解することを本研究の目的とする。これは、クラスター構造をpi中間子交換の回数と多体力の観点から理解する世界初の試みである。

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Educational Activities

  • 基幹教育のうち、「自然科学総合実験」や「基礎科学実習」、「基幹教育セミナー」を担当している。また総合科目「実践!はじめての研究」を担当し、学生の "研究" への挑戦を後押ししている。

Class subject

  • Basic Laboratory Experiments in Natural Science I

    2024.10 - 2024.12   Fall quarter

  • 実践!はじめての研究

    2023.12 - 2024.2   Winter quarter

  • 基礎科学実習

    2023.12 - 2024.2   Winter quarter

  • 自然科学総合実験

    2023.10 - 2023.12   Fall quarter

  • 基幹教育セミナー

    2023.6 - 2023.8   Summer quarter

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FD Participation

  • 2024.7   Role:Participation   Title:大学教職員職能開発FD 「⽣成AIを大学の教育・学習・業務にどのように組み込むか?-第四弾 教育現場における生成AIの導入事例-隣の教室の授業法-」

    Organizer:University-wide

  • 2024.7   Role:Participation   Title:物理学における反転授業の実践例

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2024.3   Role:Participation   Title:大学教職員職能開発FD「⽣成AIを大学の教育・学習・業務にどのように組み込むか?-第一弾 生成AIを使った授業デザイン支援のアイデア-」

    Organizer:University-wide

  • 2024.3   Role:Participation   Title:基幹教育ガイダンスFD

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2024.3   Role:Participation   Title:全学FD 「M2Bシステムの使い方」

    Organizer:University-wide

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2024  筑波大学  Classification:Intensive course  Domestic/International Classification:Japan 

  • 2020  関西大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

  • 2020  京都女子大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

  • 2014  大阪大学工業大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

Social Activities

  • 理化学研究所2022年度和光地区一般公開

    理化学研究所  2022.4

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • Dagli abissi alle stelle: KM3NeT Experience

    Giornata speciale a Città della Scienza, CITTÀ DELLA SCIENZA, Napoli, Italy  2017.9

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • KM3NeT Experiment

    FUTURO REMOTO, Piazza del Plebiscito, Napoli, Italy  2017.5

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

Media Coverage

Activities contributing to policy formation, academic promotion, etc.

  • 2021.4 - Present  

    理化学研究所, RIBF理論研究推進会議 委員

Travel Abroad

  • 2024.9 - 2024.11

    Staying countory name 1:Italy   Staying institution name 1:Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

    Staying institution name 2:Università degli Studi della Campania “Luigi Vanvitelli”

  • 2023.9 - 2023.10

    Staying countory name 1:Italy   Staying institution name 1:Istituto Nazionale di Fisica Nucleare, Sezione di Napoli